Heldon’s R400 range of copper fittings are packed or stamped R400 and are suitable for R410A with a Safe Working Pressure (SWP) of approximately 5,000 kPa at ambient temperature. A range of sizes up to 1-5/8” are currently available to suit R410A and CO2 (sub-critical) refrigerants. Enjoy the benefits of having chosen a quality Heldon product.